基于java的Oracle SQL Developer有一个支持SQL Server的插件模块。我经常在我的Mac电脑上使用它。它也是免费的。

下面是如何安装SQL Server插件:

运行SQL Developer 进入这个菜单项:Oracle SQL Developer/Preferences/Database/Third-party JDBC Drivers 单击帮助。 它将有指向MySQL、SQL Server等JAR文件的指针。 SQL Server JAR文件可以在http://sourceforge.net/projects/jtds/files/上获得

When this question was asked there were very few tools out there were worth much. I also ended up using Fusion and a Windows client. I have tried just about everything for MAC and Linux and never found anything worthwhile. That included dbvisualizer, squirrel (particularly bad, even though the windows haters in my office swear by it), the oracle SQL developer and a bunch of others. Nothing compared to DBArtizan on Windows as far as I was concerned and I was prepared to use it with Fusion or VirtualBox. I don't use the MS product because it is only limited to MS SQL.

底线是没有免费的东西是值得的，大多数商业非视窗产品也是如此

However, now (March 2010) I believe there are two serious contenders and worthwhile versions for the MAC and Linux which have a low cost associated with them. The first one is Aqua Data Studio which costs about $450 per user, which is a barely acceptable, but cheap compared to DBArtizan and others with similar functionality (but MS only). The other is RazorSQL which only costs $69 per user. Aqua data studio is good, but a resource hog and basically pretty sluggish and has non essential features such as the ER diagram tool, which is pretty bad at that. The Razor is lightning fast and is only a 16meg download and has everything an SQL developer needs including a TSQL editor.

所以最大的赢家是RazorSQL，只要69美元，就物有所值。相信我，在等待了几年之后，我终于找到了一个便宜的非窗口DBartizan的替代品，我非常挑剔。

我在Windows操作系统上使用AquaFold，但它基于Java，支持Mac OS X。

我的雇主生产了一个简单的，基于HTML5的概念验证SQL客户端，它可以用于web浏览器主机上的任何ODBC数据源，通过我们也生产的HTML5 WebDB-to-ODBC桥。这些组件都是免费的，适用于Mac、Windows等系统。

适用于这里的许多其他答案——大多数人提到的Type 1 JDBC-to-ODBC桥是Sun内置到JVM中并与JVM捆绑的桥。JVM/JRE/JDK文档总是建议不要使用这个内置组件，除非在实验场景中，或者没有其他选项存在的情况下，因为这个组件是作为概念验证构建的，从来没有打算用于生产使用。

我的雇主制作了一个企业级JDBC-to-ODBC桥，可以是单层的(完全安装在客户端应用程序主机上)，也可以是多层的(在客户端应用程序主机和ODBC数据源主机上分割组件，使任何JVM中的JDBC客户端应用程序都可以使用Mac、Windows、Linux等上的ODBC数据源)。这个解决方案不是免费的。

以上所有都可以与Sybase和Microsoft SQL Server(或其他数据库)的ODBC驱动程序一起使用，我们也生产…

不确定开源，但我听说过http://www.advenio.com/sqlgrinder/(没有尝试过，我更喜欢写Python脚本来尝试，而不是使用gui;-)。

Squirrel SQL是一个基于Java的SQL客户端，我在Windows和Linux上有很好的经验。因为它是Java，所以应该可以做到。

它是开源的。您可以同时使用多个数据库运行多个会话。